Method for separation of finely-divided substances from coarse and foreign matters.



B. S CHWERIN.

METHOD FOR SEPARATION OF FINELY DIVIDED SUBSTANCES FROM COARSE AND FOREIGN MATTERS.

APPLICATION FILED MAY 13 I915.

Patented June 19, 1917.

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ro'rno scnwnnm, or FRANKFORT-ON-THE-MAIN, GERMANY, nssrenoza 'ro nnnx'rno- OSMOSE AKTIENGESELLSCHAFT (GRAF SCHWEBIN GESELLSCHAFTLDF FRANKFORT- ON-THE-MAIN, GERMANY, A CORPORATION,

METHOD FOR SEPARATION OF To all whom it may concern:

Be it known that I, BOTHO Sonwnnm, residing at Frankfort on-the Main, Ggermany, have invented certain new and useful Improvements in Methods for Separation of Finely-Divided Substances from Coarse and Foreign Matters, of which the following is a specification.

My invention relates to improvements in a method for separating substances in suspension. It is known, that. finely. divided substances may be separated from coarse and foreignmatters which are in sus ension in a liquid by adding suitable electro ytes to the liquid containing such substances. By additions of this kind one component part is brought into the sol-state and is held in.

suspension. The coarse, foreign and oppositely charged parts are deposited in gelstate or, according to their nature and their electrical charge, are brought into a solstatie less complete or strong than that aforesa1 After the precipitation of the coarse, oppositely charged and indifferent matters, also a fractionation of the .finely divided substances held in sol-state occurs. This fractionation is performed according to the size of the particles since the coarser particles oscillate more 'feebly than and precipitate before the finer particles.

In the accompanying drawing there is illustrated, more or less diagrammatically an ap aratus adapted for carrying out the herein efore described method.

Referring to the drawing 1 designates the body of the centrifuge which is supported on a shaft 2 mounted in suitable bearings 4:, 5. The bearing 5 is shown fixed on a base 7 while the bearing 4 is carried by a oke-like frame 6 rising from said base. ower is communicated to the shaft 2 b a band 3.

The electric current is supp ied by a dynamo 11, one of the brushes of which is connected with a terminal 10 on a pole piece 8 that extends into the liquid in the receptacle 1 while the other brush is connected with a contact 9 that bears against a collar on the shaft 2.

Specification of Letters'Patent.

FINELY- DIVIDED SUBSTANCES FROM COABSE AND FOREIGN MATTERS.

' Patented J line 15 1917.

Application filed May 18, 1915. Serial No. 27,888.

I have now found, that by subjecting such mixtures in suspension to the action of 'centrifugal force the separation is accelerated and the fractionation more strongly marked.

The centrifugal movement may be eifected 1n various ways. The liquid may be centrifugated in a closed centrifuge, whereby the hquid rotates with the centrifuge. The indifl'erent and coarse particles being in'gelcondition are deposited at the partition of thecentrifuge vessel, whereas the fine and highly charged particles remain in suspension and only deposited after a length of time depending upon their electrica condition or charge and oscillation. The centrifugal movement may further be produced by causing the liquid to rotate in. a cylindrical vessel.

It is known, that the component parts of a suspension mixture which are in sol-condition may be recovered by the action of electro-osmosis. This process may be usedin'combination with the described centrifugal method. To this endfthe centrifuge rating substances in suspension in a liquid comprising adding a sultable electrolyte to the liquid and subjecting the liquid and the substance in sol-state therein to the simultaneous action of centrifugal force and an electric current.

In testimon whereof I aflix my signature in presence 0 two witnesses.

BOTHO SGHWERIN.

Witnesses:

JEAN Gum, CARI. Gm. 

